2.8.18 opt

#pragma optlevel(funcname[, funcname])

funcnamespecifies the name of a function defined within
the current translation unit. The value of level specifies
the optimization level for the named function. You can assign optimization
levels 0, 1, 2, 3, 4, 5. You can turn off optimization by setting level to 0. The functions must be declared with a prototype or empty
parameter list prior to the pragma. The pragma must proceed the definitions
of the functions to be optimized.

The level of optimization for any function listed in the pragma is reduced
to the value of -xmaxopt. The pragma is ignored when -xmaxopt=off.